Oracle inserts special characters: & amp; and & #039;. oracle inserts special characters.

Oracle inserts special characters: & and '.

When importing a batch of data to Oracle today, I encountered a problem: Toad prompts me to assign a value to a custom variable AMP. At first I was wondering that data is a series of Insert statements, how can I have custom variables? Then I searched for the keyword "AMP" and found that it was because there was a problem with the content of a field in the inserted data.

Oracle regards the URL parameter connector as a custom variable, so I need to assign a value to the variable AMP. What should we do? There are three methods:

· Method 1: Add Set define off before the SQL statement to be inserted and execute it in batches with the original SQL statement.

When we execute the SQL> show all command under SQL * PLUS, we can find a parameter: define "&" (hex 26), as shown in

......

Concat "." (hex 2e)

Copycommit 0

Copytypecheck ON

Define "&" (hex 26)

Describe DEPTH 1 LINENUM OFF INDENT OFF

Echo OFF

......

This setting is used in Oracle to identify custom variables. Now we disable it in SQL * PLUS:

SQL> Set define OFF;

Run the import script again. OK! Solve the problem.

NOTE: If it is executed in TOAD, we recommend that you disable define in the first line of each script to be imported, otherwise, an error occurs when you import the second script containing special characters.

If it is executed in SQL * PLUS, you only need to set define OFF once, and then you can import it continuously. Until you reset define ON.

Insert a statement:

SQL> insert into AA (O, resvalue) values ('A', 's' | chr (38) | 'P ');

· Method 2: replace '&' with chr (38) in an SQL statement because chr (38) is the '&' ASCII code.

SQL> Select 'Tom '| chr (38) | 'Jerry' from dual;

· Method 3: Split the original string

SQL> Select 'Tom '|' & '| 'Jerry' from dual;

We can see that method 1 is the easiest and most efficient. Method 2: because there is a function call process, the performance is slightly poor. Method 3 requires two connection strings, with the worst efficiency!

How can I insert a single quotation mark in the field? For example, It's fine. There are also three methods

· Method 1: Use escape characters

SQL> Select 'test' | ''' from dual;

Note: What are the meanings of the four single quotes? First, the first and last are character strings in Oracle, and there is no objection. So what does the second and third sign mean? The second 'is an escape character.

The third is our real content.

· Method 2: escape characters are used in different ways.

SQL> Select 'test''' from dual;

Note: The second and third are the escape characters and real content mentioned in method 1 above.

· Method 3: replace 'with chr (39) in SQL, because chr (39) is the' ASCII code

SQL> Select 'it' | chr (39) | 'fine 'from dual;